'Stepmother' definitions:

Definition of 'stepmother'

From: WordNet
noun
The wife of your father by a subsequent marriage

Definition of 'Stepmother'

From: GCIDE
  • Stepmother \Step"moth`er\, n. [AS. ste['o]pm[=o]der.] The wife of one's father by a subsequent marriage. [1913 Webster]

Synonyms of 'stepmother'

From: Moby Thesaurus